Process for the production of binders

Abstract

An improved process for the production of lacquer binders from 1,2-polyepoxides having more than one 1,2-epoxide group per molecule, comprising the steps of: (a) reacting the 1,2-polyepoxide with from 0.01 to 0.6 NH-equivalents, based on one epoxide equivalent, of an optionally substituted active amine hydrogen containing ammonium carbonic acid salt; (b) reacting the thus obtained compound with from 0.40 to 0.90 carboxyl equivalent, based on on epoxide equivalent of acrylic acid, methacrylic acid or a mixture thereof; and optionally (c) reacting the compound obtained from step (b) with from 0.40 to 0.2 carboxyl equivalents, based on one epoxide group, or a saturated aliphatic monocarboxylic acid; so that at least 80% of the epoxide groups originally present are reacted.

We claim: 
     
       1. A process for the production of lacquer binders from 1,2-polyepoxides having more than one 1,2-epoxide group per molecule which comprises the steps of: (a) reacting the 1,2-polyepoxide with from 0.01 to 0.6 NH-equivalents as hereinbefore defined, based on one epoxide equivalent, of a compound having the general formula (I) ##STR4##  wherein X is a hydrogen atom or a group H 2  NR 1 ,R 2  ; and R 1  and R 2  are the same or different and each is a hydrogen atom, an alkyl group having from 1 to 18 carbon atoms, a cyclopentyl group, a cyclohexyl group, a hydroxyalkyl group having from 2 to 18 carbon atoms in the alkyl moiety, an alkoxylalkyl group having from 1 to 4 carbon atoms in the alkoxy moiety and from 2 to 18 carbon atoms in the alkyl moiety, an alkoxy carbonylalkyl group having from 1 to 4 carbon atoms in the alkoxy moiety and from 2 to 18 carbon atoms in the alkyl moiety, an N-dialkylaminoalkyl group having from 2 to 18 carbon atoms in the alkyl moiety and from 1 to 4 carbon atoms in the N-dialkylamino moiety, a carboxyalkyl group having from 1 to 6 carbon atoms in the alkyl moiety, an aminoalkyl group having from 2 to 6 carbon atoms, an aminoalkyl group having from 2 to 6 carbon atoms in the alkyl moiety and having the carbon chain thereof interrupted by one or more --NH-- or --N(CH 3 )-groups; or R 1  and R 2  together with the nitrogen atom to which they are both attached form a piperidine or pyrrolidine ring structure;   (b) reacting the thus obtained compound with from 0.40 to 0.90 carboxyl equivalent as hereinbefore defined, based on one epoxide equivalent of acrylic acid, methacrylic acid or a mixture thereof; and optionally   (c) reacting the compound obtained from step (b) with from 0.40 to 0.2 carboxyl equivalents as hereinbefore defined, based on one epoxide group, or a saturated aliphatic monocarboxylic acid; so that at least 80% of the epoxide groups originally present are reacted.     
     
     
       2. A process as claimed in claim 1 wherein the 1,2-polyepoxide is a polyglycidyl ether of a polyhydric phenol. 
     
     
       3. A process as claimed in claim 1 wherein the 1,2-polyepoxide is a bisphenol-A-polyglycidyl ether. 
     
     
       4. A process as claimed in claim 1 wherein the 1,2-polyepoxide is a glycidyl ester of the formula ##STR5## wherein A is an at least difunctional radical of an aliphatic hydrocarbon optionally containing oxygen atoms or cycloaliphatic rings of a cycloaliphatic hydrocarbon, R is a hydrogen atom or an alkyl group having from 1 to 3 carbon atoms and n is an integer between 2 and 6. 
     
     
       5. A process as claimed in claim 1 wherein the carboxylic acid is acetic acid.